Motorcycle Efi Gasoline Engine Fuel Control Strategy Test

Today's legislation on exhaust gas emissions for motorcycles is more stringent than ever and will be even tougher in the future. The situation is more serious in China especially in recent years the rapid increase of the production and the social storage quantity rapidly. To accommodate these new laws they have to develop better engines, control systems etc. In present the motorcycles with carburetors have the problems that the fuel consumption and the emission level are high. Also it's difficult to match the three-way catalyst converter suitably. In order to improve this problem, it needs to develop electrical fuel injection system which can control the air fuel ratio accurately and can reduce the exhaust and fuel consumption of the engine.The paper presents the developments of the electronic fuel injection technology in motorcycles. By comparing and contrasting various fuel injection control approaches, the project adopted open loop control system with port fuel injection and used the speed density method to measure intake air mass.In this research a new test bench was developed. The new bench includes an improved fuel supply system and a new controlling and adjusting fuel injection system. The improvement work of the fuel supply system is to define an optimized position used to mounting the injector. This position directly influents the mixture's formation rate and the power and the exhaust of the engine, so it is one major work of the research and determined by experiments.The other major work is to develop a controlling and adjusting fuel injection system. This system can adjust the injection starting time and duration time conveniently and it can also record corresponding control parameters.Employing this system and the control strategy, the match experiment was carried on with different work conditions. The result shows that the performances ofthe electronic fuel injection system were better than the primary engine.